A scrap metal dealer claims that the mean of its cash sales is ‘no more than $80’, although an Internal Revenue Service agent believes that the dealer is being dishonest. Observing a sample of 20 cash customers, the agent finds the mean cash sales to be $91, with a standard deviation of $21. Assuming the population is distributed approximately normally, and using the 0.05 level of significance, will the agent’s suspicion be confirmed?

Q: A dpt store has a daily mean sales of $28,372.72. The standard deviation of sales is $2000. On…

A: Given: Daily μ=28372.72σ=2000 On Tuesday x=34885.21

Q: Ackerman & Goldsmith (2011) found that students who studied text from printed hard copy had better…

A: From the provided information, Sample size (n) = 10 Sample mean (M) = 77 Sample standard deviation…

Q: The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon…

A: Null hypothesis: H0: μ = 444. Alternative hypothesis: HA : μ ≠ 444 Central Limit Theorem for mean:…

Q: The time that a shopper spends in the grocery store is normallydistributed, with a mean of 45…

A: Given Information: The time that a shopper spends in the grocery store is normally distributed with…

Q: In determining automobile mileage ratings, it was found that the mpg (x) for a certain model is…

A: Given that, Mean = 32 Standard deviation = 1.3

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: GivenMean(μ)=180standard deviation(σ)=20

Q: Statewide, the average score on the verbal portion of the college entrance exam is 453, with a…

A: From the provided information, Sample size (n) = 137 Sample mean (x̅) = 502 Population standard…

Q: Suppose, at a local movie theater, the amount of money that a man spends at the concession has an…

A:

Q: "According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: The given information is  Population mean : 220 milligramssample mean:x¯=210 milligramssample…

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A: From the provided information, The hypotheses can be constructed as: H0: µ1 = µ2 H1: µ1 < µ2…

Q: Please see attached.

A: (a). It is given that:

Q: "According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: Claim : the average sodium content for a single servings of noodles is less than 220 milligrams.

Q: there sufficient evidence at a=0.01 to conclude that their health care expenditure differs from the…

A:

Q: In a random sample of 35 NFL games the average attendance was 68,729 with a standard deviation of…

A: Given: Big 10 Conference football games:   NFL games :

Q: Ackerman & Goldsmith (2011) found that students who studied text from printed hard copy had better…

A: We start with defining some of the constants in the question: Sample size n = 10. Population mean…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information- Population mean, μ = 9 years Sample size, n = 95 Significance level, α = 0.01…

Q: A researcher claims that the stomachs of blue crabs from Location A contain more fish than the…

A: Given information

Q: In a certain supermarket, a sample of 60 customers who used a self-service checkout lane averaged…

A: Introduction: Assume that the checkout times of the customers are independent of each other, between…

Q: The mean annual tuition and fees for a sample of 15 private colleges was $41,200 with a standard…

A: Given: n=15x¯=41200s=5300μ=38000α=0.05 The test hypothesis are, H0: μ=38000H1: μ≠38000. This is a…

Q: The following care grade point averages measured in a sample of 8 undergraduate students who are…

A:

Q: Given a mean price of a residential real estate sales of KD 527,000 and a standard deviation of KD…

A: To find the probability of: a) having a sale above KD 550,000 b) having a sale below KD 527,500

Q: With a sample of 62, a population mean of 29, and a standard deviation of 9, what is the standard…

A: Givensample size(n)=62population mean(μ)=29standard deviation(σ)=9

Q: The quality-control manager at a light bulb factory needs to determine whether the mean life of a…

A:

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: Let X be the random variable from normal distribution with mean (μ) = $180 and standard deviation…

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: Given that, In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a…

Q: A manufacturing company packages shipments in either large or small boxes. A random sample of 40…

A:

Q: A manufacturing company regularly consumes a special type of glue pur- chased from a foreign…

A:

Q: years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x =…

A: (a)   The following null and alternative hypotheses need to be tested: Ho: \muμ ≥ 99 Ha: \muμ <…

Q: The reading speed of second-grade students is approximately normal, with a mean of 90 words per…

A: a) The probability that a randomly selected student will read more than 95 words per minute is…

Q: The Orange County Supervisor claims that full-time salaried employees in her county have a mean…

A: Given:

Q: that empty homes are not as appealing to buyers as staged homes and, therefore, sell for lower…

A: The following information has been provided: Sample Mean 1 (\bar X_1)(Xˉ1​) = 150000150000…

Q: For a random sample of 500 students aged 15-17 in the United States, the numbers of hours a week…

A:

Q: 2. A scrap metal dealer claims that the mean of his cash sales is "no more than $80," but an…

A: Given that: Population mean(u) = $ 80 Sample mean = $ 91 SAMPLE standard deviation = $21 Sample size…

Q: Antelope Coffee, Inc., is considering the possibility of opening a gourmet coffee shop in Big Rock,…

A: mean = μ = 70000 standard deviation = σ = 5000

Q: Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys…

A: Given thatMean (µ) = 13Standard deviation (σ) = 9Sample size (n) = 35Sample mean = 17

Q: In the following study the city of Saskatoon was interested in knowing the number of hours per month…

A: we have given that   n=45 , m=50 , xbar1=15.6 ,xbar2=20.7 and s1=4.5 ,s2=3.7  and alpha=0.05

Q: Businesses such as General Mills, Kellogg's, and Betty Crocker regularly use coupons to build brand…

A: Note - As per our BNED policy, we are allowed to answer only three sub parts at a time. So, kindly…

Q: In determining automatic mileage ratings, it was found that the mog in the city for a certain model…

A:

Q: An employer claims that full time employees have a mean income of $35,000. A sample of 200 employees…

A:

Q: A technician compares repair costs for two types of microwave ovens (type I and type II). He…

A:

Q: A college professor noted that the grades of his students in an introductory statistics class were…

A: Given that, Mean = 52.50 Standard deviation = 9

Q: Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys…

A: Given: Sample size, n=35 Sample mean, x=17 Population standard deviation = 4 (a) The null and…

Q: A district councilor informs the prospective developer of a shopping centre that the average monthly…

A: Solution: Given information: n= 25 Sample size x = 2400 Sample mean μ= 2500 Population mean σ= 200…

Q: A graduate student is performing a study on a new antidepressant. The drug is supposed to reduce…

A: The random variable score follows normal distribution. We have to test whether the average score for…

Q: Subjects in a study by Dabonneville et al. (A-9) included a sample of 40 men who claimed to engage…

A:

Q: The General Electric Company clams that the life of LED light bulbs are has a mean life of 500 hours…

A: Given : Claim :  Life of LED light bulbs are has a mean life of 500 hours  S.D (σ) = 50 hours Sample…

Q: A researcher claims that the stomachs of blue crabs from Location A contain more fish than the…

A: Introduction: Denote μ1, μ2 as the true population mean weights of fish in the stomachs of blue…

Q: The instruction manual for an IKEA bookshelf claims that it will take 2 people 41 minutes to…

A: The Null hypothesis H0: μ = 41. Alternative hypothesis Ha: μ <41 Here, α =0.10 Since population…

Q: What is the standart-deviation of the following data? (select the closest value) Class Frequency 2.7…

A: The table that shows the calculations is shown below: The sample mean is calculated as follows:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.